Respiratory air flow measuring device



FIG. 1 is a top view of a respiratory air flow measuring device showing my new design.

FIG. 2 is a front view of the respiratory air flow measuring device of my new design, said front showing the internal geometry of the device.

FIG. 3 is a side view of the respiratory air flow measuring device.

FIG. 4 is a rear view of the respiratory air flow measuring device.

FIG. 5 is a bottom view (opposite FIG. 1) of the respiratory air flow measuring device; and,

FIG. 6 is a side view (opposite FIG. 3) of the respiratory air flow measuring device. 

The ornamental design for a respiratory air flow measuring device, as shown and described. 